Mudjacking vs Polyjacking: Which Concrete Leveling Method Is Right for Your Driveway?

Why do driveway slabs sink in the first place?

Most sinking starts below the concrete. A base that was not compacted well, soil that washed out from a downspout or gutter, or clay that shrinks in dry spells and swells when wet can leave voids under the slab.

Once a void forms, the slab bridges it for a while and then drops or tilts, often near the garage, along the edges or at the apron. Water then collects in the low spot, freezes in winter and makes the problem worse.

Leveling only works when the slab itself is still in reasonably sound pieces. It fixes the support underneath; it does not repair a surface that is broken into rubble or badly scaled.

How does mudjacking work?

Mudjacking, sometimes called slabjacking, uses a mixture of water, soil or sand and cement. The crew drills holes in the slab, usually larger than those used for foam, and pumps the slurry underneath until the concrete rises to the target height.

It is a long-established method and many contractors in the region have done it for years. The material is dense, which helps fill large voids, and it is made from mineral ingredients rather than chemicals.

The trade-offs are weight and moisture. The slurry adds load to soil that may already be weak, it needs time to set before heavy use, and on some sites it can wash out or shrink over time if the original water problem is not fixed.

How does polyjacking work?

Polyjacking uses a two-part polyurethane foam injected through small holes, often around the size of a coin. The foam expands under the slab, fills voids and lifts the concrete, and it typically cures enough for traffic in a short time.

Because the foam is lightweight, it adds little load to the soil below. It is also water-resistant, which is an advantage on the clay soils common across Northeast Ohio, where moisture is often what caused the settling.

The patch holes are smaller and easier to blend in, though they will still be visible. Some homeowners prefer mudjacking because it uses cement-based material rather than a petroleum-based foam, so it is worth asking any contractor what product they use and why.

What drives the cost of concrete leveling?

Leveling prices depend on the job, so instead of a single figure it helps to know what moves a quote. The size and depth of the voids, the amount of material needed, how many slabs are involved and access to the work area all play a part.

Polyurethane foam is a more expensive material than cement slurry, which is why foam quotes often run higher for the same area. On the other hand, a faster cure and smaller holes can matter more than the price difference on a busy household's only driveway.

In almost every case, leveling a sound slab costs far less than tearing it out and pouring new concrete. The best way to compare is to get quotes on your actual driveway, ideally for both methods when a contractor offers them.

• Total volume of void space under the slab
• Number of separate slabs or sections to lift
• Distance of the lift needed to reach level
• Whether downspouts, grading or joint sealing are needed first
• Equipment access to the driveway and garage

When is leveling not the right fix?

If the driveway is cracked into many pieces, heaved in multiple directions or scaling heavily across the surface, lifting it will not make it last. In those cases, replacement or a full tear-out of the worst sections is usually the more honest recommendation.

Leveling also does not cure the underlying cause on its own. If water keeps pouring off a roof onto one corner, or the joint between the slab and garage stays open, the soil will keep washing out.

A good contractor should explain why the slab sank and what will keep it from happening again. Ask about redirecting downspouts, regrading soil at the edges and sealing joints and cracks after the lift.

How long do the results last?

A well-done lift on stable soil can hold for many years, but no method stops new settlement if the soil underneath keeps changing. Freeze-thaw cycles and seasonal moisture in clay are the main forces at work in our region.

Foam's resistance to water and its light weight tend to give it an edge on wet sites, while mudjacking can perform well where voids are large and the soil is reasonably firm. Results depend as much on fixing drainage as on the material chosen.

Ask what the contractor's own warranty covers, if they offer one, since warranties and terms are set by each independent business.

What happens on the day of a leveling job?

Most leveling visits are short compared with a pour. The crew looks over the slabs, marks a drilling pattern based on where the voids sit, and sets up a pump or foam rig near the driveway.

Material goes in a little at a time while someone watches the slab rise, often with a level or string line, so the concrete does not lift too far or crack. Once the slab reaches height, the holes are patched and the area is cleaned up.

Plan to keep vehicles off the driveway until the contractor says it is ready. Foam usually allows a quicker return than slurry, but either way the crew will give you a time frame for your specific job.

• Move cars and anything stored near the sunken area before the crew arrives
• Point out downspouts, sump discharge lines and any known water problems
• Ask where the holes will go and how they will be patched
• Confirm whether joint and crack sealing are part of the quote

Can leveling help a sunken apron or garage approach?

The slab right in front of the garage and the apron at the street are two of the most common spots to settle. Both take concentrated wheel loads, and the garage approach often sits on backfill that was placed against the foundation when the house was built.

Lifting a sunken garage approach can close the trip edge at the door and send water away from the garage instead of toward it. If the apron sits in the public right-of-way, check with your city or village building department about whether any work there needs a permit.

Which leveling method should you pick?

Polyjacking often makes sense for driveways on soft or wet clay, for slabs that need to be back in service quickly, and for homeowners who want the smallest possible patch holes. It is also a common choice where adding weight to weak soil is a concern.

Mudjacking remains a reasonable option for large voids on firmer soil, for budget-conscious repairs, or when you prefer a cement-based fill. Plenty of driveways in the region have been lifted this way and held up well.

If you are unsure, tell us about your sunken slab and we can connect you with local contractors who do concrete leveling. Compare what each one says about the cause, the method, the hole pattern and the follow-up sealing before you decide.